Currently shmmni proc entry accepts all entered integer values, but the practical limit is IPCMNI (32768). This confuses user as if a bigger value were accepted but not applied correctly.
This patch changes the proc entry to use *_minmax variant to limit the accepted values accordingly. Signed-off-by: Takashi Iwai <[email protected]> --- ipc/ipc_sysctl.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c index 8ad93c29f511..0c8f89f54e61 100644 --- a/ipc/ipc_sysctl.c +++ b/ipc/ipc_sysctl.c @@ -99,6 +99,7 @@ static int proc_ipc_auto_msgmni(struct ctl_table *table, int write, static int zero; static int one = 1; static int int_max = INT_MAX; +static int ipcmni = IPCMNI; static struct ctl_table ipc_kern_table[] = { { @@ -120,7 +121,9 @@ static struct ctl_table ipc_kern_table[] = { .data = &init_ipc_ns.shm_ctlmni, .maxlen = sizeof(init_ipc_ns.shm_ctlmni), .mode = 0644, - .proc_handler = proc_ipc_dointvec, + .proc_handler = proc_ipc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &ipcmni, }, { .procname = "shm_rmid_forced", -- 2.17.0
